function s1_hello() {
   echo "hello, world!"
}


function s2_tell_who_i_am() {
   whoami
}


function s3_which_distro_do_i_use() {
   cat /etc/os-release | grep "NAME"
}


function s4_view_my_cpu_arch() {
   uname -m
}


function s5_show_first_scsi_disk_size() {
   lsblk -l | grep disk | grep '^sda ' | awk '{print $4}' | tr -d "G"
}

function s6_show_main_memory_size_in_megabytes() {
   free -m | grep "Mem:" | awk '{print $2}'
}